Just a cool name for the defense. Blitzkrieg seems to have some similarities with Viking/Berserker tactics. " Vikings lead the NFL  with a blitz rate of 56.4 percent this season"

Blitz = Blitzkrieg = quick and decisive short battles to deliver a knockout blow to an enemy state before it can fully mobilize.

Berserker = Viking raiders would anchor their largest warships before storming a beach, and engage in reckless fighting